JPH07243913A - Sensor system - Google Patents

Abstract

PURPOSE:To provide a sensor system effectively utilizing the characteristics of existing apparatuses, having a simple structure, and capable of being simply installed by optionally selecting the preset data codes based on the temperature detected by a sensor, and sending the transmission signal. CONSTITUTION:An infrared sensor section 1A constituted of pyroelectric infrared sensor l through an infrared transmission section 6 is fitted, and a camera- integrated VTR, for example, is installed at a position properly separated from the sensor section 1A while the reception section 7 of an apparatus main body 8 is made face the sensor section 1A. The reception section 7 is provided with a light reception section and a microcomputer, and the light reception section receives the infrared remote control signal from the transmission section 6 and feeds it to the microcomputer. The microcomputer compares individual frames of the remote control signal, accepts the remote control signal when two of three frames coincide, decodes the remote control code, and activates the routine for operating the apparatus main body 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor system, and more particularly to a simple unmanned sensor system for automatically operating a camera-integrated VTR, a lighting device, etc. for a predetermined time when the body temperature of a human being or an animal is detected. .

[0002]

2. Description of the Related Art Recently, a sensor system for the purpose of security and the like has been actively developed, and a sensor system for such a purpose is generally a detection unit and a device main body for taking measures when it is detected. And a communication unit between the detection unit and the device body.

In the sensor system, the configuration and performance of the detection unit vary depending on the detection target, the type, function and performance of the device main body differ depending on the purpose of the system, and the communication means is divided into wireless or wired. In terms of operation, since it is divided into manned and unmanned operations, daytime operation, nighttime operation, and 24-hour operation, various system configurations are considered.

However, what is important in constructing a sensor system is that it is cost-effective, that is, the system purpose can be achieved most effectively in a simple and inexpensive manner.

Conventionally, monitor TV systems have been widely used for crime prevention. For this, the surveillance place is photographed by a video camera for 24 hours, the obtained video data is sent to a television and displayed on a monitor screen, and a monitor observes and judges it, or a VTR with a built-in camera. There is a device in which photographed data is recorded in a VTR and reproduced at a later date.

[0006] Further, the detection unit sends a detection signal to the device body by radio waves to operate the device body, and the detection unit is configured to manually send a radio signal to the device body when a human being and an object are found. There are also existing sensor systems.

[0007]

However, theft, which is carried out in an unattended time for an individual's house, car, etc.,
For crimes such as mischief and harassment, the crime place is uncertain and it is not possible to constantly monitor the crime,
Crime prevention or identification of the criminal is often difficult.

[0008] Further, there is a problem that there is no effective countermeasure for the damage of fields such as monkeys, boars, and birds because of the fact that it is not easy to find at any time and cannot be constantly struck. is doing.

As a countermeasure for the above, a 24-hour unmanned sensor system that can reliably operate without being noticed by the target is desired, but in order to realize it with conventional technology, (1) the structure is complicated and manufactured. Costly, (2)
The device itself consumes a large amount of power because it is operating even when there is no target. (3) If the device itself is a recording device,
It was difficult to realize a system that was quite satisfactory due to problems such as wasting storage media when there were no people, and (4) limiting the frequency and the like according to the Radio Law and interference with other radio waves. .

Therefore, the present invention has a problem to be solved in a sensor system in which the characteristics of an existing device, for example, a VTR with a built-in camera can be effectively used, and the configuration can be simplified to easily set the sensor system. There is.

[0011]

In order to solve the above problems, a sensor system according to the present invention comprises a sensor for detecting temperature and a device driven by a transmission signal from the sensor, wherein the transmission signal is The data code preset based on the temperature detected by the sensor in the previous period is arbitrarily selected and transmitted.

The sensor is a pyroelectric infrared sensor; the transmission signal is transmitted using infrared rays; the device is a V equipped with a camera.
TR; selection of the data code includes at least recording start and recording stop; the device is a lighting device, a notification device, or a sensor system that is various lock control devices.

[0013]

In the sensor system configured as above,
It has the following effects. (1) When the temperature is detected by the pyroelectric infrared sensor, a preset data code, for example, a camera integrated type V
In the case of TR, by sending a code such as recording start and recording stop to the device side as an infrared signal, the existing control signal for driving the device can be used as it is.

(2) Since the sensor and the device are separated from each other, the device can be arbitrarily arranged at a position where it is difficult to find the device, and the original function of security can be exerted. .

(3) Furthermore, when the body temperature is detected, lighting for a predetermined period of time, notification by alarm sound, etc., and automatic unlocking of doors, etc., can be applied widely without being limited to security. Like

[0016]

EXAMPLES Examples of the sensor system according to the present invention will be described below. As shown in FIG. 1, the sensor system according to the present invention includes a sensor unit 1A and a device body unit 8A.

The sensor section 1A comprises a pyroelectric infrared sensor 1, an amplifier 2, and an active bandpass filter 3.
And a comparator 4, a circus code encoder 5, and an infrared transmitter 6. Also, the device body 8A
Is composed of a receiver 7 and a device body 8.

The pyroelectric infrared sensor 1 is a so-called thermal infrared sensor that detects infrared heat and converts it into a voltage, which can be used at room temperature, has a flat wavelength dependence, and has a low wavelength dependence. The price. Further, the device attached to the sensor has a feature that it is simple, and is suitable for applications such as detection of infrared rays from a moving heating object.

As shown in FIGS. 2 and 3, the principle of the pyroelectric infrared sensor 1 is as follows: a pyroelectric element 9 (ferroelectric material).
The temperature change ΔT changes the polarization magnitude Ps,
It utilizes a phenomenon (pyroelectric effect) in which ΔPs charges are generated on the surface.

That is, when the infrared rays radiated from a certain object irradiate the pyroelectric element 9, the pyroelectric element 9 absorbs the infrared rays to cause a temperature change, and as a result, the surface of the element is charged. Occurs.

The pyroelectric infrared sensor 1 having such properties uses a lead zirconate titanate (PZT) ceramic material as the pyroelectric element 9. A blackening film 10 is provided on the surface of the pyroelectric element 9 in order to efficiently convert infrared rays into heat.

FIG. 4 shows the structure of the pyroelectric infrared sensor 1, and FIG. 5 shows a circuit diagram. In FIG. 4, the pyroelectric element 9 is supported by the alumina substrate 11 housed in the case. Pyroelectric element 9 of this alumina substrate 11
An FET (Field Effect Transistor) 13 is provided on the opposite side of the cavity 12 with a cavity 12 therebetween.

The FET 13 is connected to the terminal 1 via the connection line 14.
5 and the blackening film 10 side of the pyroelectric element 9 is
It is connected to the terminal 17 via the connection line 16.

The pyroelectric element 9 is connected to the gate of the FET 13 forming a source follower, as shown in FIG. The electric charge generated in the pyroelectric element 9 flows through the resistor Rg, the voltage across the resistor Rg is converted into an output impedance of 10 KΩ by the source follower of the FET 13, and is taken out from the terminal 15.

As described above, the pyroelectric element 9 is, in principle,
Since an output signal is output according to a temperature change, it is necessary to attach a chopper for interrupting infrared rays when the object is stationary, but a chopper is not necessary when the object moves.

The directional characteristic of the pyroelectric infrared sensor 1 is as shown by the beam 18 in FIG. Therefore, as shown in FIG. 7, when an object 19 having an area S and a temperature T crosses in front of the pyroelectric infrared sensor 1 at a short distance, the output of the pyroelectric infrared sensor 1 changes with time. Curve 2 of 8
It becomes like 1.

Further, an object 2 having the same area and temperature as the object 19
When 0 crosses in front of the pyroelectric infrared sensor 1 at a long distance, the output-time curve of the pyroelectric infrared sensor 1,
The curve 22 in FIG. 8 is obtained.

If a reflecting mirror is attached behind the pyroelectric infrared sensor 1 to narrow the beam and sharpen the directivity, the output-time characteristic curve becomes sharper than that shown in FIG.

Returning to FIG. 1, the amplifier 2 is a dual operational amplifier type amplifier and has a function of amplifying the output voltage of the pyroelectric infrared sensor 1 to 60 to 80 db.

Further, the active band pass filter 3
Is 70 to 100 Hz of the output of the pyroelectric infrared sensor 1.
It has the function of amplifying the vicinity.

The comparator 4 compares the output level of the active bandpass filter 3 with a predetermined value, and when the output level exceeds the predetermined value, it is "1", and when it is not, "0".
It has a function of outputting the binary signal of the above to the circus code encoder 5.

The circus code encoder 5 includes a comparator 4
When the output of "3" becomes "1", as shown in FIG.
The remote control signal of the frame is transmitted at the frame cycle W.
As shown in FIG. 9B, the format of one frame is composed of a guide pulse having a time width t _L , a 7-bit data code, and a 5-bit category (product) code.

In the data code and category code
Waveforms representing "0" and "1" are shown in FIG.
"0" means that one cycle is T₀In the first half, off time t₀so
The second half is on time t₀It is represented by the waveform of "1" is one cycle
Is T₁In the first half, off time t ₀And the second half is on time t₁of
Represented by a waveform. t_L, T₀, T₁, T₀, T₁, Of W
Real values are shown in FIG.

Returning to FIG. 1, the remote control signal sent from the circus code encoder 5 having such a configuration passes through the resistor R1 of the infrared transmitter 6 and the transistor T.
It is input to the base of r, and the transistor Tr is turned on / off according to "1" / "0" of the data signal.

The LED of the infrared transmitter 6 transmits infrared infrared remote control signals by intermittently emitting infrared light in response to turning on / off of the transistor Tr.

The receiving section 7 has a light receiving section and a microcomputer. The light receiving section receives the infrared remote control signal from the infrared transmitting section 6 and sends it to the microcomputer. The microcomputer compares each frame of the remote control signal and, when two of the three frames match, accepts this, decodes the remote control code, and activates the routine for operating the device body 8 by this. Has become.

An application example of the sensor system of the present invention having the above structure will be described below. As shown in FIG. 12, when used as an unmanned stake-in system for recording visitors to a building on a VTR, the infrared sensor unit 1A composed of the pyroelectric infrared sensor 1 to the infrared transmitter 6 as described above. Is installed with the pointing direction facing the entrance and exit, and the camera-integrated VTR is installed at a location, for example, about 10 m away from the infrared sensor unit 1A, with the receiving unit 7 facing the infrared sensor unit 1A.

During the time when the visitor passes in front of the infrared sensor, for example, 1 to 3 minutes, the infrared sensor transmits a remote control signal to operate the camera-integrated VTR, and the visitor is photographed and recorded. Stop shooting the integrated VTR.

In this case, the circus code encoder 5
Is the code number of the VTR category (category code 01000 or 11100) in the circus code shown in FIG. After the camera-integrated VTR is set to the reception mode by transmitting the data code 1011100 of the "REC" code of 30 (indicated by A), the code No. 25 "STOP" codes (denoted by B) or N
o. A 48 "POWEROFF" code (indicated by C) is transmitted to control the operation of the VTR.

By changing the device body 8 and the type of the remote control code composed of the data code in the above embodiment, it can be widely applied to unmanned sleeplessness, extermination of animals and the like. For example, when the temperature is detected, it is possible to automatically illuminate for a certain period of time, generate an alarm sound to notify, automatically lock / unlock the door lock, and the above and the above. VT with integrated camera
It can be easily constructed so that it also serves as driving of R.

[0041]

With the configuration described above, the sensor system according to the present invention has the following effects.

(1) When the temperature is detected by the pyroelectric infrared sensor, a preset data code, for example, a recording start or recording stop code for a camera-integrated VTR, is sent to the device side as an infrared signal. By doing so, by using the existing control signal for driving the device as it is, it is possible to realize an extremely excellent effect that a system such as a simple stick-in can be realized. Also, since the device itself can be operated only for the required time,
The power consumption of the main body of the device and the consumption of the recording medium are small, and therefore, there is an extremely excellent effect that it can be operated for a long time.

(2) Since the sensor and the device are separated from each other, the device can be arranged at an appropriate position according to the environmental conditions, and a very simple effect can be realized. .

(3) Furthermore, when a body temperature is detected, lighting and an alarm sound are generated for a predetermined time, so that even a simple system is not limited to security,
It has an extremely excellent effect that it can be widely applied. For example, in the case of a proof device, when the temperature is detected by the sensor, it is illuminated for a certain period of time, and when it passes through a preset area, it is automatically illuminated to ensure the safety of traffic. You can In the case of the alarm sound generation device, for example, a check of a person entering and leaving can be automatically checked by generating an alarm sound when the temperature is detected in a preset area. In the case of various lock control devices, it is possible to automatically lock / unlock the door lock when the temperature is detected.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a sensor system according to the present invention.

FIG. 2 is an explanatory diagram showing the principle of a pyroelectric infrared sensor in the same Example.

FIG. 3 is an explanatory diagram showing the principle of a pyroelectric infrared sensor in the same Example.

FIG. 4 is an explanatory view showing the structure of the same pyroelectric infrared sensor.

FIG. 5 is a circuit diagram of the same pyroelectric infrared sensor.

FIG. 6 is an explanatory diagram showing directional characteristics of the same pyroelectric infrared sensor.

FIG. 7 is an explanatory diagram showing an operating range of the same pyroelectric infrared sensor.

FIG. 8 is an explanatory diagram showing an output of the same pyroelectric infrared sensor.

FIG. 9 is an explanatory diagram showing a format of an output signal of the circus code encoder in the embodiment.

FIG. 10 is an explanatory diagram showing specifications of a waveform of the output signal.

FIG. 11 is an explanatory diagram showing an example of numerical values of the same specifications.

FIG. 12 is an explanatory diagram showing an application example of the sensor system according to the present invention.

FIG. 13 is an explanatory diagram showing a remote control code by a data code in the same application example.

[Explanation of symbols]

 1 Pyroelectric Infrared Sensor 2 Amplifier 3 Active Band Pass Filter 4 Comparator 5 Sark Code Encoder 6 Infrared Transmitter 7 Light Receiver 7 8 Device Main Body 9 Pyroelectric Element 10 Black Film 11 Alumina Substrate 12 Cavity 13 FET 14, 16 Connection Lines 15 and 17 Terminals 18 Directivity curves 19 and 20 Targets 21 and 22 Pyroelectric infrared sensor output curves W Frame period R1 and R2 Resistors Tr Transistors LEDs Infrared diodes A, B and C Data code positions

Claims (6)

[Claims] 1. A sensor for detecting temperature, and a device driven by a transmission signal from the sensor, wherein the transmission signal is an arbitrary data code preset based on the temperature detected by the sensor in the previous period. The sensor system is characterized in that it is selected and sent to. 2. The sensor system according to claim 1, wherein the sensor is a pyroelectric infrared sensor. 3. The sensor system according to claim 1, wherein the transmission signal is transmitted by using infrared rays. 4. The sensor system according to claim 1, 2 or 3, wherein the device is a VTR equipped with a camera. 5. The sensor system according to claim 1, wherein the selection of the data code includes at least recording start and recording stop. 6. The device according to claim 1, wherein the device is a lighting device, a notification device, or various lock control devices.
The sensor system according to 2 or 3.